Table 7

Example of uncertainties on the reactivity (MOX configuration at room temperature) in pcm due to the nuclear data. The contribution of 1H in H2O comes from the present work. The other contributions were calculated with the covariance data base COMAC [32] developed at the CEA of Cadarache.

Isotopes (n,f) Capture (n,n) (n,n′) (n,xn) Total
1H in H2O   46 110           119
10B   8             8
16O   114 24 4         117
90Zr   11 24 7         27
91Zr   13 16 4         21
92Zr   8 22 4         24
94Zr   2 59 3         59
96Zr   2 13 1         14
235U 2 6 3 1   5   4 9
238U 114 88 80 −60 25 35 12   160
238Pu 1 70 −20 1   9 1   67
239Pu 278 371 26 5   57 0 126 484
240Pu 42 178 −16 −5 1 2 9   182
241Pu 108 96 8     88 58   179
242Pu 3 131 10 2   2 1   131
241Am −3 47 2 29   1     47
Total 322 475 156 −59 25 111 60 126 619

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